How it work:
It works like other recuperation unit, air go out charge something and when getting back is heated with "something" As something I use couple spring stateliness dish clearing tools.
Because I have no way how to change direction of DC fans I use two in opposite direction.
And small board for switching and display time
- 60 second out
- 60 second in
There is lot space for tweaking, sensor an more.
I think we need some measurements, but unfortunately for this measurements is summer near a and outside
temperature is almost same like outside.